Key Findings: Luteolin, an antioxidant in celery, parsley, and bell peppers, delayed gray fur in mice by protecting pigment-producing cells. The compound boosts proteins that keep melanocytes (hair color cells) active without affecting hair growth. Human relevance? Unproven, but the study adds to evidence that diet may play a role in aging gracefully. Gray hair might feel inevitable, but a finding from Japanese researchers has people eyeing their grocery lists differently.